code: def dump_dot(obj, filename):
      """
      Dumps a nx.Graph to .dot file
      :param obj: the nx.Graph (or equivalent) to save
      :param filename: a string or file-like object
      """
      nx.nx_agraph.write_dot(obj, filename)
  
imports: import ast
  import sys
  import joblib
  import networkx
  import numpy
  import pandas
  import scipy.sparse
  from spektral.data.graph import Graph
label_desc: Use image node_id 6 for calling a global function with example usage: dump_dot(obj, filename) without return types